Physics need help plz!!?

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Physics need help plz!!?



The drawing shows two copper [α = 17 × 10-6 (C°)-1] rods of different lengths mounted on one side of an immovable wall. The gap between the ends of the rods is given in the drawing for a temperature of 26 °C. What change in the gap occurs when the rods are heated to 77 °C? 
Gap is 0.23cm 


1.4 × 10-4 cm (decrease) 

2.0 × 10-4 cm (increase) 

3.0 × 10-4 cm (increase) 

Not enough data given for an answer. 

No change occurs. The gap remains at 0.23 cm.



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the answer is 2.0x10-4 (increase)